Question

taking the example of an element of atomic number 10 explain how the electronic configuration of the atom of an element relate to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number​

Answer 1

element of atomic no. 10

has configuration

2,8

this shows it has two shells

which shows it belongs to second period

since it has 8 electrons in the outermost shell

hence its valency will be zero

for group number you can add 10 to it

8+10=18 it belongs to group 18

Answer 2

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